드론을 이용한 다시점 투영 이미지 제작 연구

최기창,권순철,이승현,Choi, Ki-chang,Kwon, Soon-chul,Lee, Seung-hyun 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.6

Holographic Stereogram can provide the depth perception without the visual fatigue and dizziness because it use multiple images acquired from the multiple viewpoints. In order to produce a holographic stereogram, it is necessary to obtain perspective images of a live object and record it on film using a digital hologram printer. when acquiring perspective images, the hologram without distortion can be produced only when the perspective images with a constant distance between the camera and the target is obtained. If the target is small, it is possible to keep the constant distance from the camera to object. but if it is large, this is difficult to keep the constant distance. In this study, we photograph the large object using the POI (Point of Interest) function which is one of the smart flight modes of drone to produce perspective images required for the hologram production. after that, problems such as the unexpected shakings and distance change between camera and object is corrected in post production. as a result, we produce the perspective images.

사회적 위축아동의 사회이해능력에 관한 연구

변찬석 ( Chan Suk Byun ),최기창 ( Ki Chang Choi ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2004 정서ㆍ행동장애연구 Vol.20 No.4

사회적 위축아동의 마음이론에 관한 연구

변찬석 ( Chan Suk Byun ),최기창 ( Ki Chang Choi ) 한국특수교육문제연구소 2004 특수교육저널 : 이론과 실천 Vol.5 No.4

본 연구의 목적은 학령기에 있는 사회적 위축아동을 대상으로 마음이론과 사회적 위축간의 관계를 규명하여, 사회적 위축원인의 한 부분이 마음이론에 존재하는지를 확인하는데 있다. 초등학교 4학년 191명을 대상으로 또래평정법과 교사평정법을 동시에 사용하여 사회적 위축아동을 선별한 다음, 이들에 대하여 각각 마음이론 검사를 실시하고, 사회적 위축아동과 일반아동으로 구분하여 이들 집단 별 마음이론 차이를 검증한 결과, 사회적 위축아동은 어렵지 않은 상황에서는 사회이해능력과 감정이해능력이 일반아동과 유사하나, 어려운 상황에서는 일반아동에 비해 떨어지며, 은유이해능력의 경우는 검사의 난이도와 상관없이 일반아동과 유사한 정도의 능력을 보이는 것으로 나타났다. The purpose of this study was to investigate differences between normal children and socially withdrawn children(SWC) in their Theory of Mind(TOM). This study questions were as follows: First, are there any signigicant differences between normal children and SWC in social understanding by difficulty level and by sex? Second, are there any signigicant differences between normal children and SWC in emotional understanding by difficulty level and by sex? Third, are there any signigicant differences between normal children and SWC in metaphorical understanding by difficulty level and by sex? Students participated in this study were 191 fourth grade children(104 boys: 54.5%) and 87 girls: 45.5%) attending at an elementary school in Won-Ju city. The sample was classified into two groups: (1) a group of 20 SWC; (2) a group of 171 normal children. The measures used in this study were the social withdrawal rating scale by peers, the social withdrawal rating scale by teachers, and the cartoon-formed TOM tasks made by the researcher. The data collected from this study were analyzed by MANOVA, two-way ANOVA and t-test. The results were as follows: First, SWC in social understanding performed significantly poorly only on high level test of social understanding than normal children. But there was no difference by sex. Second, SWC in emotional understanding performed significantly poorly only on high level test of social understanding than normal children. But there was no difference by sex. Third, SWC in metaphorical understanding performed on both level test of social understanding as same as normal children. The conclusions of this study show that SWC has not much difference from normal children in TOM in case of low level tasks. However, SWC has difference from normal children in case of high level TOM tasks. There is no sexual difference within normal and SWC group. Suggestions were given with issue about subject selection, additional variables of theory of mind, difficult level of test, and sub type of SWC subjects.

인공지능 : 강화학습을 이용한 무인 자율주행 차량의 지역경로 생성 기법

김문종 ( Moon Jong Kim ),최기창 ( Ki Chang Choi ),오병화 ( Byong Hwa Oh ),양지훈 ( Ji Hoon Yang ) 한국정보처리학회 2014 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.3 No.9

무인 자율주행 차량에서의 경로 생성 기법은 차량이 자동적으로 안전하고 효율적인 경로를 생성하고 주행할 수 있도록 해 준다. 경로에는 크게 전역경로와 지역경로가 있다. 전역경로는 차량이 출발점으로부터 도착점까지 가기 위해 주행해야 하는 구간을, 지역경로는 전역경로에서 얻은 구간을 주행하기 위해서 차량이 실제로 주행해야 할 경로를 의미한다. 본 논문에서는 지역경로 생성을 위하여 효율성 높은 곡선 함수를 사용하는 기존연구에서 더 나아가 학습을 통해 경로를 생성하는 방법을 제안한다. 먼저 강화학습을 통해서 후보경로에 대한 예측 보상 값을 얻고 보상 값이 최고가 되는 경로를 찾는 작업을 한다. 또한 인공 신경망을 통해서는 생성된 경로에 최적화된 조향 명령을 주기 위해 조향 각을 학습하는 작업을 한다. 더 나아가 주행하는 경로에 장애물이 발견되더라도 이를 효율적으로 회피하는 최적의 경로를 학습기법을 통해 만들어낸다. 본 논문에서 제안된 알고리즘의 우수성은 실제 주행 환경으로 모델링한 시뮬레이션 실험을 통해 검증되었다. Path generation methods are required for safe and efficient driving in unmanned autonomous vehicles. There are two kinds of paths: global and local. A global path consists of all the way points including the source and the destination. A local path is the trajectory that a vehicle needs to follow from a way point to the next in the global path. In this paper, we propose a novel method for local path generation through machine learning, with an effective curve function used for initializing the trajectory. First, reinforcement learning is applied to a set of candidate paths to produce the best trajectory with maximal reward. Then the optimal steering angle with respect to the trajectory is determined by training an artificial neural network. Our method outperformed existing approaches and successfully found quality paths in various experimental settings, including the cases with obstacles.

인지측면에서의 자폐장애의 원인과 문화

변찬석 ( Chan Suk Byun ),최기창 ( Ki Chang Choi ) 한국초등특수교육학회 2002 초등특수교육연구 Vol.4 No.1

경제적 빈곤이 아동 학교생활 행동에 미치는 영향

이민호 ( Min Ho Lee ),배내윤 ( Nae Yoon Bae ),이금섭 ( Geum Sub Lee ),최기창 ( Ki Chang Choi ),이미란 ( Mi Lan Lee ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2004 정서ㆍ행동장애연구 Vol.20 No.4

우리나라 서비스産業의 生産性 分析

崔起昌 건국대학교 1991 대학원 학술논문집 Vol.33 No.-

Even though the field of the service industry in Korea occupys almost half of the whole industry, the development of this field lags behind greatly in comparison with other fields. Therefore, confronted with the problem of improving the productivity of the service industry as an immediate problem this study aims at grasping the present situation of productivity in relation to the service industry in korea and its international standard, and indentifying the cause of declined productivity. chapter 2 accounts for the controversial problem of measuring productivity and the method of measuring productivity. And Chapter 3 is concerned with the comparative analysis of the present situation of service productivity in Korea, and that of productivity in such advanced countries as U.S.A and Japan and of service productivity in such competitive counterpart as Taiwan and Singapore. As a result the productivity of the service industry in Korea showed poor results in comparison with competitive counterparts as well as advanced countries, especially Singapore. The cause of this poor productivity in the service industry, as a result of its analysis in chapter 4, is as follows : Firstly, for its reason attributed to the characteristics of the service industry the sector of the service industry could helping lagging behind in comparison with the sector of the manufacturing industry. Secondly, for its reason of underdeveloped process of industrialization development of the service industry in korea has still come to fullmaturity. Thirdly, owing to the lack of adjustment to service economization, the pattern of economy is lacking in adjusting itself to economization ever though the economization as regards the field of service is extremely rapidly being made. Fourthly, the awareness of the management on productivity of the service industry is deficient. Therefore, measures for the improvement of productivity of the service industry in korea are as follows : Firstly, korea economy requires to make an effort to adjust itself to service economization as urgently as possible. Secondly, operation of the large-scale whoresale center, the industrial products delivery complex, and point of sales system have to be actively promoted through distribution modernization of wholesale and retail businesses of organization and cooperation of medium or smaller merchants and the modernization of conventional markets. Thirdly, for the purpose of the improved productivity of the financial industry, government should proceed to upbring the sound development of the financial industry and autogenous force. Fourthly, as the improvement of productivity in the service industry should be achieved through quality control, managerial efforts are required as regards service quality.

장애아동 가족의 일상생활에서 나타나는 정서문제

이민호,최기창,이원령,김미경,최신애 대구대학교 특수교육재활과학연구소 2004 특수교육재활과학연구 Vol.43 No.1

The purpose of this study was to measure the quality of life in family having children with disabilities and to find out ways supporting for them. We surveyed questionnaires about stress, sibling-relation, and family role. After that, we analyzed this data using frequency-analyzing. The results of this study were as follows: First, they worried about instructional intervention and social adaptation for their children. Especially we found that the drinking problem of their parents happened. Second, sibling-relations were usually good. But sometimes the violence problem happened. Third, the distinction between sibling and children with disabilities existed in the quality of life. Last, family felt uncomfortable, unhappy, and resentment. This study had such limitation as the small number of survey districts and appropriation in measure variables.

장애아 가족과 비장애아 가족간의 가정생활 질적 만족도에 관한 실증 연구 : 어머니들을 중심으로 Specifically Life of Mothers

김미경,이민호,이원령,최신애,최기창 한국정서학습장애아교육학회 2001 정서ㆍ행동장애연구 Vol.17 No.1

A survey was conducted to discover the degree of satisfaction about life of mothers of children without disabilities and mothers of children who have disabilities. In order to enhance the quality of life of families with disabled children, this study analyzed some factors that influence the degree of satisfaction about home life, with the purpose of identifying components of family support systems. The results of the study indicated that, for most factors related to satisfaction about home life, there is a statistically significant difference between mothers of disabled children and mothers of children without disabilities. Also, there was a statistically significant difference between the demographic characteristics of the two groups of subjects, factors such as the age of the mother, number of children, family income, educational background, religious background, and type of residence. Each group of subjects was analyzed separately in order to examine the effects of demographic factors on the degree of satisfaction about home life. It was found that, for families without disabled children, there was no main effect for demographic factors. In contract, in terms of the effects of demographic factors on the quality of life, there were statistically significant differences among mothers of children with disabilities, indicating that the degree of satisfaction about life among mothers of children with disabilities are significantly different, depending on the demographic characteristics of such families.